ABSTRACT

The conventional Orthogonal Frequency Division Multiplexing (OFDM) can be simply implemented using Inverse Discrete Fourier Transform (IDFT), and DFT instead of bank of modulator and bank of demodulator, respectively. However, the OFDM can be modified using chaotic interleaving that reduces the 1-Dimension (1-D), and 2-Dimension (2-D) burst errors, and improve the Bit-Error-Rate (BER) performance. In fact, the OFDM system suffers from high sensitivity to Carrier Frequency Offset (CFO). This paper presents a Joint Low-Complexity Regularised Zero Forcing (JLCRZF) equaliser for OFDM system based chaotic interleaving. The proposed JLCRZF jointly performs the equalisation and CFO compensation processes using banded-matrix approximation concept. Simulation results show that the proposed JLCRZF equaliser acts well especially in case of estimation errors.

摘要

传统的正交频分复用 (OFDM) 可以简单地使用离散傅立叶逆变换 (IDFT) 和 DFT 分别代替调制器组和解调器组来实现。然而，可以使用混沌交织来修改 OFDM，以减少一维 (1-D) 和二维 (2-D) 突发错误，并提高误码率 (BER) 性能。事实上，OFDM 系统对载波频率偏移 (CFO) 具有很高的敏感性。本文提出了一种用于基于 OFDM 系统的混沌交织的联合低复杂度正则化迫零 (JLCRZF) 均衡器。提议的 JLCRZF 使用带状矩阵近似概念联合执行均衡和 CFO 补偿过程。仿真结果表明，所提出的 JLCRZF 均衡器表现良好，尤其是在估计错误的情况下。